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[英]how to Terminate program if user inputs invalid username and password several times
[英]How to show password recovery form after user enters invalid credentials three times
嗨,evryone可以幫我嗎..我在使用Visual Studio Community 2015的 Windows窗體應用程序上有一個代碼,我有一個textBox ,名稱是用戶名 ,另一個是密碼 ,最后一個是登錄,如果用戶要登錄,它將在這里得到一個tree times錯誤,我想要它自動顯示忘記密碼的問題,以及如果用戶在登錄表單時是tree times錯誤,該如何恢復密碼。 在我進入數據庫表格之前,我不知道您能不能幫助您並解釋如何做。
這是我的代碼
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SQLSERVER_VISUALSTUDIO_COMMUNITY
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
txt_Password.PasswordChar = '*';
}
private void txt_login_Click(object sender, EventArgs e)
{
if (txt_USername.Text == "" && txt_Password.Text == "")
{
MessageBox.Show("Please enter your password and user_name");
txt_USername.Clear();
txt_Password.Clear();
}
else if (txt_USername.Text == "jondygonzales" && txt_Password.Text == "sharkwebcaster")
{
MessageBox.Show("successfully log_in");
Form1 f = new Form1();
f.Show();
Form2 main = new Form2();
main.Show();
this.Hide();
}
}
}
}
您需要做的是保持一個計數器,當用戶名和密碼無效時,計數器將增加一。
您檢查此變量值,當它達到3時,將向用戶顯示密碼恢復表單。
public partial class Form1 : Form
{
int loginAttemps = 0;
public Form1()
{
InitializeComponent();
txt_Password.PasswordChar = '*';
}
private void txt_login_Click(object sender, EventArgs e)
{
if (txt_USername.Text == "" && txt_Password.Text == "")
{
MessageBox.Show("Please enter your password and user_name");
txt_USername.Clear();
txt_Password.Clear();
}
else if (txt_USername.Text == "jondygonzales" && txt_Password.Text == "sharkwebcaster")
{
loginAttempts = 0;
MessageBox.Show("successfully log_in");
Form1 f = new Form1();
f.Show();
Form2 main = new Form2();
main.Show();
this.Hide();
}
else
{
loginAttempts += 1;
if(loginAttemps == 3)
{
RecoveryForm recForm = new RecoveryForm(); // You need to use correct Form here.
recForm.Show();
this.Hide();
}
}
}
}
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